I got comments on my artwork in kindergarten due to level of detail and such things. I was oil painting landscapes at age 8.
I took every elective I could in school, and would have taken more if AP and college prep classes weren't a priority for my parents. I used how-to books, and I still look up techniques from time to time. I've had lots and lots of practice: I went for years drawing and painting daily. That was probably my biggest increase in quality. I used to wish for art school.
My current liking is doing surrealist and visionary art in watercolor and ink: I've currently 3 canvases waiting on acrylic.
And through it all, I truly think it is a combination of talent plus practice plus interest/focus in some form. Most folks with enough practice can make beautiful landscapes and still life pictures, just like folks can learn to take a basic excellent picture most times. Everyone can learn basics.
Not everyone can bend their minds in ways to incorporate subdued symbolism in surrealist work - not everyone can look at a canvas in that way. Some of the really great photography is because the person thought to take the picture - not everyone does that in that way. Not everyone can create. That is where the talent bit comes in.
However, if art didn't interest me, I very much doubt I would have filled my time with it to get better.
I think this works similarly for math and other things, for the majority of us.